Normalize my music with ffmpeg and python

Two pass loudnorm
ffmpeg -y -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 1 -filter:a loudnorm=print_format=json -f flac /dev/null

ffmpeg -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 2 -filter:a loudnorm=I=-30.0:linear=true:measured_I=-4.52:measured_LRA=1.90:measured_thresh=-14.64 -c:a libopus -b:a 320k test441.opus